Question

The emission spectrum of hydrogen discovered first and the region of the electromagnetic spectrum in which it belongs, respectively are

• A. Lyman, ultraviolet
• B. Lyman, visible
• C. Balmer, ultraviolet
• D. Balmer, visible

Answer 1

Answer: (D)

FactIn $1885$ , Balmer for the first time showed that the wave numbers of spectral lines present in the visible region in hydrogen spectrum are given by,
$\overline{v}\left(c{m}^{-1}\right)=109677\left(\frac{1}{(2{)}^2}-\frac{1}{n^2}\right)$
Here, $n=3,4,5,\dots$
Thus, Balmer spectrum of hydrogen was discovered first and it lies in the visible region.